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I have a fireplace that is being remodeled to give the appearance of a southwest stucco/adobe fireplace, and I would like to use wonderboard as the underlayment. The finished product will be stucco over wire lath and the wonderboard is used to provide shape. What is the best method for building-up several layers of wonderboard? Is thin-set adequate or should I also use concrete screws?
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Use both thinset and screws. Good luck.
*Ditto
*I can't say for sure without seeing what you have but it occurs to me that you may not need underlayment at all unless it is for further heat resistance. Metal lath is made to be used with out any backing except for studs or channels or the like. I am talking about diamond mesh here not woven wire.
*John is right, forget the wonderboard and just use the diamond mesh which is expanded metal. If you use wire lath that has paper backing, it will burn. You will find the diamond mesh fun and easy to use.
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I have a fireplace that is being remodeled to give the appearance of a southwest stucco/adobe fireplace, and I would like to use wonderboard as the underlayment. The finished product will be stucco over wire lath and the wonderboard is used to provide shape. What is the best method for building-up several layers of wonderboard? Is thin-set adequate or should I also use concrete screws?